After having exchanged my current system (it produces its own current) I was always confronted with a kind of hum in my system. Of course it is a complex installation divided between two preamplifiers, Audio Research Anniversary 40 and EMT 66 JPA. As I had this never before I was looking for the reason, what could be the bad intruder?

I was accompanied by my electronic professional team, searching with me for the troublemaker. We thought it might be coming from the subwoofers as they are also carrying an electronic part, a 1000 Watt amp.

No, it was not the subwoofer system. We then went into the WAVACs. By lowering the volume the hum disappeared. We need this lower volume (1/3) of the WAVACs and at the same time need to regulate the volume at the preamplifiers (Audio Research, EMT).

As we usually have magnetic fields coming from the units with power systems (Phono, Preamp, digital sources) the WAVACs amplify those radiations. Simple as that 😂

But you need to have electronic engineers to find this 🥲